Add a new meilisearch_types crate

Move `meilisearch_error` to `meilisearch_types::error`
Move `meilisearch_lib::index_resolver::IndexUid` to `meilisearch_types::index_uid`
Add a new `InvalidIndexUid` error in `meilisearch_types::index_uid`

meilisearch-types/src/lib.rs

@@ -0,0 +1,2 @@
+pub mod error;
+pub mod index_uid;